Added the uw_ct_expand_collapse_group migration that uses the...
requested to merge feature/ISTWCMS-5751-g3passar-expand/collapse-migration into feature/ISTWCMS-5751-jpconsta-expand/collapse-migration
Added the uw_ct_expand_collapse_group migration that uses the UwContentFieldsDeriver to read all content fields from D7 and creates the Expand Collapse entities. Right now the entities only have the title. The layout builder content will be added afterward